Evaluating the Maturity of CPS in discrete manufacturing shop-floor: A group AHP method with fuzzy grade approach

Discrete manufacturing faces challenges to improve quality and efficiency, reduce labour and costs, as well as the shifting market from customized manufacturing to short-series production, just to name a few. CPS which combines physical world and cyber world is a key technology of coping these challenges particularly in the shop floor level. However, due to its complexities and heterogeneities, CPS development and implementation in discrete manufacturing field is still in rudimentary phase which requires feasible methods to evaluating the maturity of current system. This paper proposes an evolution process of CPS in discrete manufacturing which can be characterized by two-dimensional perspectives concerning MT (manufacturing technology) and ICT (information and communication technology) elements. A maturity model (CPSMM) is presented to conceptualize the maturity of CPS implementation process in discrete manufacturing shop floor. The importance weights of indicators in the maturity model are acquired based on AHP with group decision. A semantic grading approach is proposed to guide and constrain accessing process which allows using triangle fuzzy numbers. Procedures and algorithms on calculating CPS-AHP are given and applied in a mechanical shop floor for illustration.